BIG BANG?

Listening to Radio 4 News programmes they don a piece on Stephen Hawking as he reached 70 they had a question and answer. Question 1 was how did the universe begin? His answer was that there was first nothing and then there was an explosion and the Universe started No mention of God or Supreme Being.  Now these non believers like Dawkins and Bailey expect us to believe this? One moment there is nothing then there is a big bang if there was nothing what created the big bang? It must have been something not nothing. Richard Bailey mockingly called my belief in God as” Martin and his imaginary friend” insinuating I was not all there yet people who believe in the Big Bang without a God are ?